Device for separating and delivering individual heddles to a draw-in position

Abstract

The invention concerns a device for individually separating heddles bunched into packs and arranged on heddle slide rails, the lifting of individual heddles from the pack being implemented by suction nozzles and the heddles being moved into position for drawing-in the associated warp threads. A blow tube is provided to generate the suction effect and is angularly bent at its front end constructed as a blow nozzle. A small tube is so inserted into the wall of the angular bend that its part within the wall of the tube forms an ejector nozzle and its external end acts as a suction nozzle to lift individual heddles off a pack. The blow nozzle may be brought into line with the direction of advance of the heddles whereby a blast of air issuing from the blow nozzle effects the further motion of a lifted heddle following the drawing-in of the warp thread.

What I claim is: 
     
       1. In a device for individually separating drop wires or heddles bunched into packs and mounted on heddle slide rails, using individually separating means associated with the individual packs by the intermediary of which the foremost drop wire or heddle of a pack first is lifted a discrete extent from the pack and then is moved into a position for drawing-in a warp thread, and including a pair of blow tubes displaceable parallel to the pack and rotatable about their longitudinal axes with suction nozzles arranged at bent-around ends of said blow tubes, the improvement comprising a blow nozzle (12a) in at least one of said blow tubes (12), said blow nozzle being located in the bent-around end of the respective blow tube (12) and directed along the direction of advance (V) of the heddle (6) or drop wire, and an oppositely directed suction nozzle (14) inserted as an ejector nozzle (2) into said blow nozzle (12a), whereby a blast through the respective blow tube (12) generates a suction effect at the suction nozzle (14) to lift the foremost drop wire or heddle from the pack for movement with the displaceable blow tube to a drawing-in position. 
     
     
       2. The device according to claim 1, wherein said suction nozzle (14) comprises a small suction nozzle tube (14) of a lesser cross-section than the respective blow tube (12), said nozzle tube (14) being inserted into the respective bent-around end from the outside to pass through the wall of the blow tube (12) of larger cross-section at its point of curvature and extending within the blow tube (12) approximately to the end of the curvature of said bent-around end. 
     
     
       3. The device according to claim 1, further including an accessory magnet (15) mounted at an effective outer end of said suction nozzle (14) for aiding in the separation of a heddle or drop wire from said pack. 
     
     
       4. The device of claim 1, wherein said separating means comprise a rotatable tubular guide member (8) axially displaceable in parallel to said pack, said blow tube (12) extending longitudinally through said tubular guide member (8), a carrier arm (13) rigidly mounted on the respective tubular guide member (8) for rotation and axial displacement with said tubular guide member (8), and magnetic means (16, 16') mounted on said carrier arm (13) for transporting a heddle or drop wire from said pack to said drawing-in position, said magnetic means being located behind said suction nozzle (14), as viewed from said pack, for becoming effective after said suction nozzle has separated a drop wire or heddle from said pack. 
     
     
       5. The device of claim 4, wherein said magnetic means (16, 16') comprise a ring magnet, said suction nozzle (14) extending through said ring magnet, said suction nozzle having a suction end extending substantially to a plane defined by a surface of said ring magnet facing said pack. 
     
     
       6. The device of claim 4, wherein said blow tube (12) is mounted inside said tubular guide member (8) for axial displacement with said tubular guide member through a first common displacement range and for axial displacement relative to said tubular guide member through a second separate displacement range, whereby an effective end of said suction nozzle carried by said blow tube (12) is movable from a position close to said magnetic means to a position in front of said pack for separating a heddle or drop wire from said pack.